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NASA AIS Engine to USB
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2016-05-27, 07:19 PM
I have a NASA AIS Engine which outputs data on a serial lead on a Black wire from pin 2 and a screen from pin 5 at 38400 baud, which of the terminals do I use on the serial to USB adapter.
R- and R+ or T- and T+ or GND Thanks, John
2016-05-27, 08:28 PM
The NASA AIS puts out a sort of RS232
I use a serial to USB adapter myself ( prolific chipset ) Your adapter is NMEAv2 to USB You can try R(eceive) + and - Pin2 -> R+ Pin5 (shield) -> R- If it does not work you can try to connect NASA pin5 (shield ) to GND instead of R- Either may work. Googling RS422 vs RS232 can provide more technical info since NMEAv2 is electrically RS422 Regards,
2016-05-27, 08:57 PM
(2016-05-27, 08:28 PM)SYWindveer Wrote: The NASA AIS puts out a sort of RS232 Thanks for that, I am 50 miles from the coast so going to struggle to get a signal at the moment, otherwise I would have just kept swapping them about.
2016-05-28, 11:07 AM
My unit is an older AIS engine 2 and it sends empty AIS messages even when no signal is received
2016-05-29, 11:18 AM
Mine is the original one, going to get the chip upgrade when I see it working.
Tried every combination now and not seen any message in inspector. Confident I have open plotter setup correctly with the correct port and baud 38400 but not seen anything in inspector nor have I seen the green led on the serial to usb convertor light. I set open plotter to output to the convertor and the red light was flickering fine though obviously the AIS engine could do nothing with the data. Thanks, John
2016-05-29, 03:15 PM
(2016-05-27, 08:57 PM)gowzel Wrote:(2016-05-27, 08:28 PM)SYWindveer Wrote: The NASA AIS puts out a sort of RS232 Mine outputs a dummy message when it powers up, which shows up in Opencpn. Just pull out the power lead and push back in. On the usb/serial it's wired to recieve and ground. Works fine. Sent from my SGP511 using Tapatalk
2016-05-29, 05:55 PM
(2016-05-29, 03:15 PM)PaddyB Wrote:Yes mine works fine with a usb to serial as well.(2016-05-27, 08:57 PM)gowzel Wrote:(2016-05-27, 08:28 PM)SYWindveer Wrote: The NASA AIS puts out a sort of RS232 NASA cuts a lot of corners with their circuitry to keep the price down. That's why it may not be compatible with balanced NMEA interfaces. I have upgraded my AIS Engine 1 to version 2 with the upgrade chip so it can receive AIS B messages. I was worth the upgrade
2016-05-31, 08:29 AM
I think that my converter could be faulty. I have set it up to input the GPS nmea data into the AIS engine, the red led is flickering away and I have a 2.2V to 0V signal out of the converter into the AIS. And I have a slower 0V to 0.25V signal on the black and screen wire from th AIS engine. But there is a permanent 4.6 V between R- and R+ and between R+ and GND on the converter. With no signal being sent or received surely there should not be 4.6V there.
Anyone able to test there own? Thanks, John
2016-05-31, 09:57 PM
(2016-05-31, 08:29 AM)gowzel Wrote: I think that my converter could be faulty. I have set it up to input the GPS nmea data into the AIS engine, the red led is flickering away and I have a 2.2V to 0V signal out of the converter into the AIS. And I have a slower 0V to 0.25V signal on the black and screen wire from th AIS engine. But there is a permanent 4.6 V between R- and R+ and between R+ and GND on the converter. With no signal being sent or received surely there should not be 4.6V there. I don't have the Sailoog converter and I can't find the schematic for that device. I did connect my AIS tonight to a homebrew NMEA mux and it does not work. This leads me to believe the NASA AIS is only compatible with NMEAv1 which is RS232 compliant , not RS422 as with the Sailoog converter. Your converter may not be faulty at all. You may want to get a serial to USB converter, they can be found on eBay for a few dollars. Mine works like a charm with the NASA AIS. Hope this helps |
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